Wide bandwidth transceiver

ABSTRACT

The wide bandwidth transceiver includes a receiver section, a transmitter section, and a local oscillation module. The local oscillation module generates a first and a second local oscillation. The transmitter section converts an outbound baseband signal and/or a low intermediate frequency (IF) signal into a first outbound radio frequency (RF) signal based on the second local oscillation when the wide bandwidth transceiver is in a second wireless standard mode and converts the outbound baseband and/or the low IF signal into a second outbound RF signal based on the first and second local oscillations when the wide bandwidth transceiver is in a first wireless standard mode. The receiver section converts a first inbound RF signal into an inbound low IF signal and/or a baseband signal based on the first and second local oscillations when the wide bandwidth transceiver is in the first wireless standard mode and converts a second inbound RF signal into the inbound low IF signal and/or the baseband signal based on the second local oscillation when the wide bandwidth transceiver is in the second wireless standard mode.

This patent application is claiming priority under 35 USC § 120 as acontinuing patent application of co-pending patent application entitledWIDE BANDWIDTH TRANSCEIVER, having a filing date of Nov. 27, 2002, and aSer. No. 10/306,047.

BACKGROUND OF THE INVENTION

1. Technical Field of the Invention

This invention relates generally to wireless communication systems andmore particularly to transceivers used within such wirelesscommunication systems.

2. Description of Related Art

Communication systems are known to support wireless and wire linedcommunications between wireless and/or wire lined communication devices.Such communication systems range from national and/or internationalcellular telephone systems to the Internet to point-to-point in-homewireless networks. Each type of communication system is constructed, andhence operates, in accordance with one or more communication standards.For instance, wireless communication systems may operate in accordancewith one or more standards including, but not limited to, IEEE 802.11,Bluetooth, advanced mobile phone services (AMPS), digital AMPS, globalsystem for mobile communications (GSM), code division multiple access(CDMA), local multi-point distribution systems (LMDS),multi-channel-multi-point distribution systems (MMDS), and/or variationsthereof.

Depending on the type of wireless communication system, a wirelesscommunication device, such as a cellular telephone, two-way radio,personal digital assistant (PDA), personal computer (PC), laptopcomputer, home entertainment equipment, et cetera communicates directlyor indirectly with other wireless communication devices. For directcommunications (also known as point-to-point communications), theparticipating wireless communication devices tune their receivers andtransmitters to the same channel or channels (e.g., one of the pluralityof radio frequency (RF) carriers of the wireless communication system)and communicate over that channel(s). For indirect wirelesscommunications, each wireless communication device communicates directlywith an associated base station (e.g., for cellular services) and/or anassociated access point (e.g., for an in-home or in-building wirelessnetwork) via an assigned channel. To complete a communication connectionbetween the wireless communication devices, the associated base stationsand/or associated access points communicate with each other directly,via a system controller, via the public switch telephone network, viathe Internet, and/or via some other wide area network.

For each wireless communication device to participate in wirelesscommunications, it includes a built-in radio transceiver (i.e., receiverand transmitter) or is coupled to an associated radio transceiver (e.g.,a station for in-home and/or in-building wireless communicationnetworks, RF modem, etc.). As is known, the receiver is coupled to theantenna and includes a low noise amplifier, one or more intermediatefrequency stages, a filtering stage, and a data recovery stage. The lownoise amplifier receives inbound RF signals via the antenna andamplifies then. The one or more intermediate frequency stages mix theamplified RF signals with one or more local oscillations to convert theamplified RF signal into baseband signals or intermediate frequency (IF)signals. The filtering stage filters the baseband signals or the IFsignals to attenuate unwanted out of band signals to produce filteredsignals. The data recovery stage recovers raw data from the filteredsignals in accordance with the particular wireless communicationstandard.

As is also known, the transmitter includes a data modulation stage, oneor more intermediate frequency stages, and a power amplifier. The datamodulation stage converts raw data into baseband signals in accordancewith a particular wireless communication standard. The one or moreintermediate frequency stages mix the baseband signals with one or morelocal oscillations to produce RF signals. The power amplifier amplifiesthe RF signals prior to transmission via an antenna.

As is further known, the many standards that govern wirelesscommunication systems provide different operating frequency ranges. Forexample, IEEE802.11a operates in the 5.25 gigahertz and 5.75 gigahertzfrequency ranges, IEEE802.11b and Bluetooth operate in the 2.4 gigahertzfrequency range, and GSM operates in the 900 megahertz frequency range.Accordingly, the analog transmitter and receiver portions (e.g., theportions of a radio that convert between analog baseband signals and RFsignals) are implemented differently for each different frequency rangeof the various standards. As such, if the analog transmitter andreceiver portions are to be implemented on an integrated circuit, anintegrated circuit manufacturer needs to produce separate integratedcircuits for each different standard. Integrated circuit manufacturersare acutely aware of the added costs of developing, manufacturing, andsupporting multiple integrated circuits of related technology.

Therefore, a need exists for a wide bandwidth transceiver that operatesover a wide range of frequencies such that a single transceiver maysupport multiple wireless communication standards.

BRIEF SUMMARY OF THE INVENTION

The present invention is directed to apparatus and methods of operationthat are further described in the following Brief Description of theDrawings, the Detailed Description of the Invention, and the claims.Other features and advantages of the present invention will becomeapparent from the following detailed description of the invention madewith reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

FIG. 1 is a schematic block diagram of a wireless communication systemin accordance with the present invention;

FIG. 2 is a schematic block diagram of a wireless communication devicein accordance with the present invention;

FIG. 3 is a schematic block diagram of a receiver section in accordancewith the present invention;

FIG. 4 is a schematic block diagram of a transmitter section inaccordance with the present invention;

FIG. 5 is a schematic block diagram of an alternate receiver section inaccordance with the present invention;

FIG. 6 is a schematic block diagram of an alternate transmitter sectionin accordance with the present invention;

FIG. 7 is a schematic block diagram of a local oscillation module inaccordance with the present invention;

FIG. 8 is a schematic block diagram of another embodiment of a receiversection in accordance with the present invention; and

FIG. 9 is a schematic block diagram of another embodiment of atransmitter section in accordance with the present invention.

DETAILED DESCRIPTION OF THE INVENTION

FIG. 1 is a schematic block diagram illustrating a communication system10 that includes a plurality of base stations and/or access points12-16, a plurality of wireless communication devices 18-32 and a networkhardware component 34. The wireless communication devices 18-32 may belaptop host computers 18 and 26, personal digital assistant hosts 20 and30, personal computer hosts 24 and 32 and/or cellular telephone hosts 22and 28. The details of the wireless communication devices will bedescribed in greater detail with reference to FIG. 2.

The base stations or access points 12-16 are operably coupled to thenetwork hardware 34 via local area network connections 36, 38 and 40.The network hardware 34, which may be a router, switch, bridge, modem,system controller, et cetera provides a wide area network connection 42for the communication system 10. Each of the base stations or accesspoints 12-16 has an associated antenna or antenna array to communicatewith the wireless communication devices in its area. Typically, thewireless communication devices register with a particular base stationor access point 12-14 to receive services from the communication system10. For direct connections (i.e., point-to-point communications),wireless communication devices communicate directly via an allocatedchannel.

Typically, base stations are used for cellular telephone systems andlike-type systems, while access points are used for in-home orin-building wireless networks. Regardless of the particular type ofcommunication system, each wireless communication device includes abuilt-in radio and/or is coupled to a radio. The radio includes a highlylinear amplifier and/or programmable multi-stage amplifier as disclosedherein to enhance performance, reduce costs, reduce size, and/or enhancebroadband applications.

FIG. 2 is a schematic block diagram illustrating a wirelesscommunication device that includes the host device 18-32 and anassociated radio 60. For cellular telephone hosts, the radio 60 is abuilt-in component. For personal digital assistants hosts, laptop hosts,and/or personal computer hosts, the radio 60 may be built-in or anexternally coupled component.

As illustrated, the host device 18-32 includes a processing module 50,memory 52, radio interface 54, input interface 58 and output interface56. The processing module 50 and memory 52 execute the correspondinginstructions that are typically done by the host device. For example,for a cellular telephone host device, the processing module 50 performsthe corresponding communication functions in accordance with aparticular cellular telephone standard.

The radio interface 54 allows data to be received from and sent to theradio 60. For data received from the radio 60 (e.g., inbound data), theradio interface 54 provides the data to the processing module 50 forfurther processing and/or routing to the output interface 56. The outputinterface 56 provides connectivity to an output display device such as adisplay, monitor, speakers, et cetera such that the received data may bedisplayed. The radio interface 54 also provides data from the processingmodule 50 to the radio 60. The processing module 50 may receive theoutbound data from an input device such as a keyboard, keypad,microphone, et cetera via the input interface 58 or generate the dataitself. For data received via the input interface 58, the processingmodule 50 may perform a corresponding host function on the data and/orroute it to the radio 60 via the radio interface 54.

Radio 60 includes a host interface 62, digital receiver processingmodule 64, an analog-to-digital converter 66, a receiver section 72, areceiver filter module 71, a transmitter/receiver switch 73, a localoscillation module 74, memory 75, a digital transmitter processingmodule 76, a digital-to-analog converter 78, a transmitter section 82, atransmitter filter module 85, and an antenna 86. The antenna 86 may be asingle antenna that is shared by the transmit and receive paths asregulated by the Tx/Rx switch 73, or may include separate antennas forthe transmit path and receive path. The antenna implementation willdepend on the particular standard to which the wireless communicationdevice is compliant.

The digital receiver processing. module 64 and the digital transmitterprocessing module 76, in combination with operational instructionsstored in memory 75, execute digital receiver functions and digitaltransmitter functions, respectively. The digital receiver functionsinclude, but are not limited to, digital intermediate frequency tobaseband conversion, demodulation, constellation demapping, decoding,and/or descrambling. The digital transmitter functions include, but arenot limited to, scrambling, encoding, constellation mapping, modulation,and/or digital baseband to IF conversion. The digital receiver andtransmitter processing modules 64 and 76 may be implemented using ashared processing device, individual processing devices, or a pluralityof processing devices. Such a processing device may be a microprocessor,micro-controller, digital signal processor, microcomputer, centralprocessing unit, field programmable gate array, programmable logicdevice, state machine, logic circuitry, analog circuitry, digitalcircuitry, and/or any device that manipulates signals (analog and/ordigital) based on operational instructions. The memory 75 may be asingle memory device or a plurality of memory devices. Such a memorydevice may be a read-only memory, random access memory, volatile memory,non-volatile memory, static memory, dynamic memory, flash memory, and/orany device that stores digital information. Note that when theprocessing module 64 and/or 76 implements one or more of its functionsvia a state machine, analog circuitry, digital circuitry, and/or logiccircuitry, the memory storing the corresponding operational instructionsis embedded with the circuitry comprising the state machine, analogcircuitry, digital circuitry, and/or logic circuitry.

In operation, the radio 60 receives outbound data 94 from the hostdevice via the host interface 62. The host interface 62 routes theoutbound data 94 to the digital transmitter processing module 76, whichprocesses the outbound data 94 in accordance with a particular wirelesscommunication standard (e.g., IEEE802.11a, IEEE 802.11b, Bluetooth, etcetera) to produce digital transmission formatted data 96. The digitaltransmission formatted data 96 will be a digital base-band signal or adigital low IF signal, where the low IF typically will be in thefrequency range of one hundred kilohertz to a few megahertz.

The digital-to-analog converter 78 converts the digital transmissionformatted data 96 from the digital domain to the analog domain. Thetransmitter section 82 converts the analog baseband or low IF signalinto an outbound RF signal 98 based on a first and/or second localoscillation 81 and/or 83 provided by local oscillation module 74. Thetransmitter filter module 85, which may be a high frequency bandpassfilter, filters the outbound RF signal 98 and provides the filtered RFsignal to the Tx/Rx switch module 73 for subsequent transmission by theantenna 86 to a targeted device such as a base station, an access pointand/or another wireless communication device.

The radio 60 also receives an inbound RF signal 88 via the antenna 86,which may have been transmitted by a base station, an access point, oranother wireless communication device. The antenna 86 provides theinbound RF signal 88 to the receiver filter module 71 via the Tx/Rxswitch 73, where the Rx filter 71, which may be a high frequencybandpass filter, filters the inbound RF signal 88. The Rx filter 71provides the filtered RF signal to receiver section 72, which convertsthe amplified inbound RF signal into an inbound low IF signal orbaseband signal based on the first and/or second oscillation 81 and/or83 provided by local oscillation module 74. The receiver section 72provides the inbound low IF signal or baseband signal to the ADC 66.

The analog-to-digital converter 66 converts the filtered inbound low IFsignal from the analog domain to the digital domain to produce digitalreception formatted data 90. The digital receiver processing module 64decodes, descrambles, demaps, and/or demodulates the digital receptionformatted data 90 to recapture inbound data 92 in accordance with theparticular wireless communication standard being implemented by radio60. The host interface 62 provides the recaptured inbound data 92 to thehost device 18-32 via the radio interface 54.

As one of average skill in the art will appreciate, the wirelesscommunication device of FIG. 2 may be implemented using one or moreintegrated circuits. For example, the host device may be implemented onone integrated circuit, the digital receiver processing module 64, thedigital transmitter processing module 76 and memory 75 may beimplemented on a second integrated circuit, and the remaining componentsof the radio 60, less the antenna 86, may be implemented on a thirdintegrated circuit. As an alternate example, the radio 60 may beimplemented on a single integrated circuit. As yet another example, theprocessing module 50 of the host device and the digital receiver andtransmitter processing modules 64 and 76 may be a common processingdevice implemented on a single integrated circuit. Further, the memory52 and memory 75 may be implemented on a single integrated circuitand/or on the same integrated circuit as the common processing modulesof processing module 50 and the digital receiver and transmitterprocessing module 64 and 76.

FIG. 3 is a schematic block diagram of receiver section 72 that may beconfigured in one of two modes. As shown, the receiver section 72includes a 1^(st) receiver intermediate frequency (IF) stage 100, areceiver switch module 102, and a 2^(nd) receiver IF stage 104. In a1^(st) configuration of the receiver section 72, the receiver section 72receives a 1^(st) inbound RF signal 106 via the 1^(st) receiver IF stage100. The 1^(st) receiver IF stage 100 converts the 1^(st) inbound RFsignal 106 into a 1^(st) inbound IF signal 108 based on the 1^(st) localoscillation 81. For example, if the 1^(st) inbound RF signal 106corresponds to an IEEE802.11a signal, which has a carrier frequency of5.25 gigahertz, the 1^(st) local oscillation 81 may have a frequency of2.85 gigahertz. Accordingly, the 1^(st) inbound IF signal 108 has acarrier frequency of 2.4 gigahertz (e.g., 5.25 GHz-2.85 GHz). For thisexample, the frequency of the first local oscillation was selected suchthat the resulting 1^(st) inbound IF signal has a carrier frequency of2,4 GHz, which substantially equals the carrier frequency of Bluetoothbased signals and/or IEEE802.11b signals. Accordingly, for this example,the receiver section 72 may be configured to process IEEE802.11a signalsor Bluetooth/IEEE802.11b signals.

As an alternative example, the 1^(st) local oscillation 81 may have afrequency of 4.35 gigahertz such that the 1^(st) inbound IF signal 108has a carrier frequency of 900 megahertz. In this example, the receiversection 72 would be configurable to process 1^(st) inbound RF signal 106that are compliant with IEEE802.11a, which has a carrier frequency of5.25 gigahertz, or configured to process 2^(nd) inbound RF signals 110that are compliant with GSM, which has a carrier frequency of 900megahertz.

As yet another alternate example, the 1^(st) local oscillation 81 mayhave a frequency of 1.5 gigahertz and the 1^(st) inbound RF signal 106may have a carrier frequency of 2.4 gigahertz in accordance with 802.11band/or Bluetooth. The resulting 1^(st) inbound IF signal has a carrierfrequency of 900 megahertz. According to this example, the receiversection 72 may be configured to process 1^(st) inbound RF signals 106that are compliant with 802.11b and/or Bluetooth or configured toprocess 2^(nd) inbound RF signals 110 that are compliant with GSM orother standard that utilizes 900 megahertz transmissions.

Continuing with the 1^(st) configuration of the receiver section 72, thereceiver switch module 102, which may be a high frequency multiplexor,switching network, and/or tri-state input buffering network, couples the1^(st) inbound IF signal 108 to the 2^(nd) receiver IF stage 104. The2^(nd) receiver IF stage 104 converts the 1^(st) inbound IF signal 108into an inbound low IF signal 114 based on the 2^(nd) local oscillation83. The inbound low IF signal 114 may have a carrier frequency in therange from baseband to a few megahertz. Continuing with the precedingexamples, if the 1^(st) inbound RF signal 106 has a carrier frequency of5.25 gigahertz, the 1^(st) local oscillation 81 has a frequency of 2.85gigahertz such that the 1^(st) inbound IF signal has a carrier frequencyof 2.4 gigahertz, the 2^(nd) local oscillation 83 may have a frequencyof approximately 2.4 gigahertz such that the resulting inbound low IFsignal has a zero to a few megahertz carrier frequency. In the 2^(nd)example, if the 1^(st) inbound RF signal has a 5.25 gigahertz carrierfrequency and the 1^(st) local oscillation 81 has a frequency of 4.35gigahertz such that the 1^(st) inbound IF signal 108 has a carrierfrequency of 900 megahertz, the 2^(nd) local oscillation 83 may have afrequency of approximately 900 megahertz. In the 3^(rd) example, if the1^(st) inbound RF signal 106 has a carrier frequency of 2.4 gigahertz,the 1^(st) local oscillation 81 may have a frequency of 1.5 gigahertzsuch that the 1^(st) inbound IF signal 108 has a carrier frequency of900 megahertz and the 2^(nd) local oscillation 83 will have a frequencyof 900 megahertz.

In a 2^(nd) configuration of receiver section 72, the receiver iscoupled to receive the 2^(nd) inbound RF signal 110. In thisconfiguration, the receiver switch module 102 passes the 2^(nd) inboundRF signal 110 to the 2^(nd) receiver IF stage 104. The 2^(nd) receiverIF stage 104 converts the 2^(nd) inbound RF signal 110 into the inboundlow IF signal 114 based on the 2^(nd) local oscillation 83. In thisconfiguration, the 1^(st) receiver IF stage 100 and the 1^(st) localoscillation 81 may be disabled.

In general, for a dual mode receiver in accordance with the presentinvention, the 2^(nd) inbound RF signal 110 corresponds to the modehaving the lower carrier frequency, which for the preceding examples waseither 2.4 gigahertz (GHz) or 900 megahertz and the 1^(st) inbound RFsignal 106 corresponds to the mode having the higher carrier frequency,which for the preceding examples was either 5.25 GHz or 2,4 GHz.

FIG. 4 is a schematic block diagram of transmitter section 82 that canbe configured in one of two modes. The transmitter section 82 includes a1^(st) transmitter IF stage 120, a transmitter switch module 124, a2^(nd) transmitter IF stage 122, and a power amplifier 126. In a 1^(st)mode, the transmitter section is operably coupled to convert an outboundlow IF signal 128, which has a carrier frequency in the range ofbaseband to a few megahertz, into an outbound RF signal 136 having aspecified carrier frequency. For example, the outbound RF signal 136 mayhave a carrier frequency of 900 megahertz, 2.4 megahertz, or 5.25megahertz. If the transmitter section 82 is to convert the low IF signal128 into an output RF signal 136 having a 5.25 gigahertz carrierfrequency, the transmitter switch module 124 is configured such that theoutbound low IF signal 128 is up converted by both the 1^(st) and 2^(nd)transmitter IF stages 120 and 122. As one of average skill in the artwill appreciate, the configuration of the transmitter section 82corresponds to the configuration of the receiver section 72. As such, ifthe receiver section is configured to receive 5.25 gigahertz carrierfrequency signals, the transmitter section is configured to output radiofrequency signals having a carrier frequency of 5.25 gigahertz.

In a 1^(st) configuration of the transmitter section 82, the transmitterswitch module 124, which may be a multiplexer, high frequency switchingnetwork, or tri-state buffering network, provides the 1^(st) outbound RFsignal 130 to the 2^(nd) transmitter IF stage 122 and provides theoutput of the 2^(nd) transmitter IF stage 122 to the power amplifier126. In a 2^(nd) configuration of the transmitter section 82, thetransmitter switch module 124 bypasses the 2^(nd) transmitter IF stage122 and passes the 1^(st) outbound RF signal 130 to the power amplifier126. Similarly to the receiver section 72, the transmitter section 82may have multiple configurations to provide multiple modes of operation.

As with the examples provided for the receiver section 72, thetransmitter section 82 may have a dual mode of up converting low IFsignals to 900 megahertz and 2.4 gigahertz, to 2.4 gigahertz and 5.25gigahertz, or to 900 megahertz and 5.25 gigahertz. For instance, if thetransmitter section 82 is to up convert the outbound low IF signal 128to 2.4 GHz or to 5.25 GHz, the first local oscillation would be 2.85 GHzand the second local oscillation would be 2.4 GHz. Thus, in the firstmode, the 1^(st) transmitter IF stage 120 up-converts the outbound lowIF signal into the 1^(st) outbound RF signal 130 having a carrierfrequency of 2.4 GHz. The transmitter switching module 124 provides the1^(st) outbound RF signal 130 to the 2^(nd) transmitter IF stage 122.The 2^(nd) transmitter IF stage 122 up-converts the 1^(st) outbound RFsignal 130 to the 2^(nd) outbound RF signal 132 based on the 1^(st)local oscillation 81, which has a frequency of 2.85 GHz. As such, the2^(nd) outbound RF signal 132 has a carrier frequency of 5.35 GHz. Inthe 2^(nd) configuration, the transmitter switch module 124 passes the1^(st) outbound RF signal 130 to the power amplifier 126. In this mode,the resulting outbound RF signal 136 has a carrier frequency of 2.4 GHz.

FIG. 5 is a schematic block diagram of an alternate receiver section 72.The receiver section 72 includes the 1^(st) IF stage 100, the receiverswitch module 102, and the 2^(nd) IF stage 104. The 1^(st) IF stage 100includes a low noise amplifier 140, 1^(st) and 2^(nd) mixers 142 and144, and a filter module 146. The 2^(nd) IF stage 104 includes 1^(st)and 2^(nd) mixers 150 and 152 and filter module 154. The receiversection 72 also includes a low noise amplifier 148.

In a first mode of the receiver section 72, the 1^(st) IF stage 100receives the 1^(st) inbound IF signal 106 and amplifies it via the lownoise amplifier 140. The low noise amplifier 140 outputs an in-phasecomponent and a quadrature component of the RF signal 106. The in-phasecomponent (I), which may be represented by sin(ω_(RF1)t), is mixed viamixer 142 with an in-phase component of the 1^(st) local oscillation 81,which may be represented by sin(ω_(LO1)t). The 2^(nd) mixer 144 mixesthe quadrature component (Q) of the RF signal, which may be representedby cos(ω_(RF1)t), with the quadrature component of the 1^(st) localoscillation 81, which may be represented by cos(ω_(LO1)t). The resultingmixed signals are then filtered by filter module 146, which may be abandpass filter, to produce the 1^(st) inbound IF signal 108, which maybe represented by sin[(ω_(RF1)−ω_(LO1))t].

The receiver switch module 102 provides the 1^(st) inbound IF signal 108to the 2^(nd) IF stage 104. The 1^(st) mixer 150 of the 2^(nd) IF stage104 mixes the in-phase component, e.g., sin(ω_(RF)t), of the 1^(st)inbound IF signal 108 with the in-phase component, e.g., sin(ω_(LO2)t),of the 2^(nd) local oscillation 83-I to produce a first mixed signal.Note that, for this mode, ω_(RF) equals ω_(RF1)−ω_(LO1). The 2^(nd)mixer 152 of the 2^(nd) IF stage 104 mixes the quadrature component ofthe 1^(st) inbound IF signal 108, e.g., cos(ω_(RF)t), with the in-phasecomponent of the 2^(nd) local oscillation i.e., cos(ω_(LO2)t), toproduce a second mixed signal. The first and second mixed signals arefiltered via filter module 154, which may be a bandpass filter, toproduce the inbound low IF signal 114, e.g.,sin(ω₀t)=sin[(ω_(RF)−ω_(LO2))t}.

In a second mode of the receiver section 72, the receiver section 72receives the 2^(nd) inbound RF signal 110, e.g., sin(ω_(RF2)t), via thelow noise amplifier 148. In this mode, the receiver switch module 102passes the output of low noise amplifier 148 to the mixers 150 and 152of the 2^(nd) IF stage 104. The 1^(st) mixer 150 mixes the in-phasecomponent, e.g., sin(ω_(RF)t), of the 2^(nd) inbound RF signal 110 withthe in-phase component, e.g., sin(ω_(LO2)t), of the 2^(nd) localoscillation 83-I to produce a first mixed signal. Note that, for thismode, ω_(RF) equals ω_(RF2). The 2^(nd) mixer 152 mixes the quadraturecomponent of the 2^(nd) inbound RF signal 110, e.g., cos(ω_(RF)t), withthe in-phase component of the 2^(nd) local oscillation i.e.,cos(ω_(LO2)t), to produce a second mixed signal. The first and secondmixed signals are filtered via filter module 154 to produce the inboundlow IF signal 114, e.g., sin(ω₀t)=sin[(ω_(RF)−ω_(LO2))t}.

FIG. 6 is a schematic block diagram of an alternate transmitter section82 that includes the 1^(st) IF stage 120, the transmitter switch 124,the 2^(nd) IF stage 122 and the power amplifier 126. In this embodiment,the 1^(st) IF stage 120 includes 1^(st) and 2^(nd) mixers 162 and 164, asummation module 166, and a filter module 168. The 2^(nd) IF stage 122includes 1^(st) and 2^(nd) mixers 172, summation module 174 and filtermodule 176. When the transmitter section 82 is configured to up convertthe outbound low IF signal 128 to the higher frequency range mode ofoperation, the transmitter switch module 124 couples the output of the1^(st) IF stage 120 to the 2^(nd) IF stage 122 such that the outboundlow IF signal 128 is up converted by the 1^(st) and 2^(nd) IF stages 120and 122. The 1^(st) IF stage 120 up converts the outbound low IF signal128 by mixing the in-phase component thereof, e.g., sin(ω₀t), with thein-phase component of the 2^(nd) local oscillation 83, e.g.,sin(ω_(LO2)t) and by mixing the quadrature component thereof, e.g.,cos(ω₀t), with the quadrature component of the 2^(nd) local oscillation83, e.g., cos(ω_(LO2)t). The resulting mixed signals are summed viasummation module 166 and then filtered via filter module 168. The filtermodule 168, which may be a bandpass filter, outputs the 1^(st) outboundRF signal 130, which may be represented by sin[(ω₀+ω_(LO2))t].

The transmit switch module 124 provides the 1^(st) outbound RF signal130 to the 2^(nd) IF stage 122. Mixing module 170 mixes the in-phasecomponent of the 1^(st) outbound RF signal 130, e.g.,sin[(ω₀+ω_(LO2))t], with the in-phase component of the 1^(st) localoscillation 81, e.g., sin(ω_(LO1)t). Mixing module 172 mixes thequadrature component of the 1^(st) outbound RF signal 130, e.g.,cos[(ω₀+ω_(LO2))t], with the quadrature component of the 1^(st) localoscillation 81, e.g., cos(ω_(LO1)t). The resulting mixed signals aresummed via summation module and filtered via filter module 176. Thefilter module 176, which may be a bandpass filter, outputs the 2^(nd)outbound RF signal 132, which may be represented bysin[(ω₀+ω_(LO2)+ω_(LO1))t].

The transmit switch module 124 then provides the 2^(nd) outbound RFsignal 132, as the selected outbound RF signal 134, to power amplifier126, which produces the outbound RF signal 136.

In the alternate configuration, the transmitter section 82 up convertsthe outbound low IF signal 128 to the lower of the two frequency rangemodes. In this instance, the transmitter switch 124 bypasses the 2^(nd)IF stage 122 and provides the 1^(st) outbound RF signal 130 to the poweramplifier 126. The power amplifier 126 then produces the outbound RFsignal 136 from the 1^(st) outbound RF signal 130.

FIG. 7 is a schematic block diagram of a local oscillation module 74that includes a local oscillation generator 180, 1^(st) oscillationmodule 182 and 2^(nd) oscillation module 184. The local oscillationgenerator 180 produces a reference oscillation 186. The 1^(st)oscillation module 182 manipulates the reference oscillation 186 toproduce the 1^(st) local oscillation 81. The 1^(st) local oscillation 81may be buffered and provided to the receiver section 72 and separatelyto the transmitter section 82. Similarly, the 2^(nd) oscillation module184 manipulates the reference oscillation 186 to produce the 2^(nd)local oscillation 83. The 2^(nd) local oscillation 83 may be bufferedand separately provided to the receiver section 72 and transmittersection 82.

In one embodiment of the local oscillation module 74, the localoscillation generator 180 is a crystal oscillator that produces areference oscillation 186. The 1^(st) and 2^(nd) oscillation modules 182and 184 may be separate phase locked loops that produce the 1^(st) localoscillation 81 and 2^(nd) local oscillation 83, respectively. Forexample, the crystal generator may generate a clock signal ofapproximately 20 megahertz while the 1^(st) local oscillation 81 may be2.85 gigahertz and the 2^(nd) local oscillation may be 2.4 gigahertz.

In a 2^(nd) embodiment of the local oscillation module 74, the localoscillation generator 180, the 1^(st) oscillation module 182 and the2^(nd) oscillation module 184 may each be phase locked loops producingtheir respective oscillations. In a 3^(rd) embodiment of the localoscillation module 74, the local oscillation generator 180 may be aphase locked loop that produces a reference oscillation 186 at afrequency similar to the frequency of the 1^(st) local oscillation 81.The 2^(nd) oscillation module 184 may be a phase locked loop orfrequency adjust module to produce the 2^(nd) local oscillation 83 fromthe reference oscillation 186 or from the 1^(st) local oscillation 81.In this example, the 1^(st) oscillation module 182 may be an additionalbuffer, or frequency adjust module.

FIG. 8 is a schematic block diagram of an alternate embodiment ofreceiver section 72. In this embodiment, the receiver section 72 may beconfigured in one of three modes. For example, the receiver section 72may be configured to receive 3^(rd) inbound RF signals 194, 1^(st)inbound RF signals 106 or 2^(nd) inbound RF signals 110. In one example,the 3^(rd) inbound RF signals 194 have a carrier frequency of 5.25gigahertz, the 1^(st) inbound RF signals 106 have a carrier frequency of2.4 gigahertz and the 2^(nd) inbound RF signals 110 have a carrierfrequency of 900 megahertz.

When the receiver section 72 is configured to process the 2^(nd) inboundRF signals 110, which for example may have a carrier frequency of 900megahertz, the 2^(nd) receiver switch module 192, the 1^(st) receiver IFstage 100 and the 3^(rd) receiver IF stage 190 may be disabled.Accordingly, the receiver switch module 102 provides the 2^(nd) inboundRF signals 110 to the 2^(nd) receiver IF stage 104. The 2^(nd) receiverIF stage 104 converts the 2^(nd) inbound RF signals 110 into the inboundlow IF signals 114 based on the 2^(nd) local oscillation 83. Forexample, if the 2^(nd) inbound RF signal 110 has a carrier frequency of900 megahertz, the 2^(nd) local oscillation 83 has a frequency of 900megahertz such that the inbound low IF signal 114 has a carrierfrequency of zero to a few megahertz.

When the receiver section 72 is configured to receive 1^(st) inbound RFsignals 106, which may have a carrier frequency of 2.4 gigahertz, the3^(rd) receiver IF stage 190 may be deactivated. In this mode, the2^(nd) receiver switch module 192 provides the 1^(st) inbound RF signals106 to the 1^(st) receiver IF stage 100. The 1^(st) receiver IF stage100 converts the 1^(st) inbound RF signals 106 into 1^(st) inbound IFsignals 108 based on the 1^(st) local oscillation 81, which may have afrequency of 1.5 gigahertz. The receiver switch module 102 passes the1^(st) inbound IF signals 108 to the 2^(nd) receiver IF stage 104. The2^(nd) receiver IF stage 104 converts the 1^(st) inbound IF signal 108into the inbound low IF signal based on the 2^(nd) local oscillation 83,which may have a frequency of 900 megahertz.

In a 3^(rd) configuration, the receiver section 72 is operably coupledto receive the 3^(rd) inbound RF signals 194. The 3^(rd) receiver IFstage 190 converts the 3^(rd) inbound RF signals 194 into 3^(rd) inboundIF signals 198 based on a 3^(rd) local oscillation 196. The 3^(rd) localoscillation 196 may have a frequency of 2.85 gigahertz when the 3^(rd)inbound RF signals 194 have a carrier frequency of 5.25 gigahertz. The2^(nd) switch module 192 provides the 3^(rd) inbound IF signals 198 tothe 1^(st) receiver IF stage 100. The 1^(st) receiver IF stage 100converts the 3^(rd) inbound IF signals 198 into the 1^(st) inbound IFsignals 100 based on the 1^(st) local oscillation 81, which may have afrequency of 1.5 gigahertz.

The receiver switch module 102 provides the 1^(st) inbound IF signals108 to the 2^(nd) IF stage 104. The 2^(nd) receiver IF stage 104converts the 1^(st) inbound IF signal 108 into the inbound low IF signal114 based on the 2^(nd) local oscillation 83 which may have a frequencyof 900 megahertz.

FIG. 9 is a schematic block diagram of another embodiment of transmittersection 82 that includes the 1^(st) transmitter IF stage 120, the 2^(nd)transmitter IF stage 122, the transmitter switch module 124, a 2^(nd)transmitter switch module 200, a 3^(rd) transmitter IF stage 202 and thepower amplifier 126. As illustrated, the transmitter section 82 may beconfigured to up convert the outbound low IF signal 128 to an output RFsignal 136 having a 1^(st), 2^(nd) or 3^(rd) carrier frequency. Forexample, the 1^(st) carrier frequency may correspond to 900 megahertz,the 2^(nd) carrier frequency to 2.4 gigahertz and the 3^(rd) carrierfrequency to 5.25 gigahertz.

When the transmitter section 82 is configured to up convert the outboundlow IF signal 128 to the outbound RF signal 136 having a carrierfrequency of 900 megahertz, the 2^(nd) local oscillation 83 has afrequency of 900 megahertz. Accordingly, the 1^(st) transmitter IF stage120 up converts the outbound low IF signal 128 to the 1^(st) outbound RFsignal 130 having a carrier frequency of 900 megahertz. The transmitterswitch module 124 and 2^(nd) transmitter switch module 200 areconfigured to pass the 1^(st) outbound RF signal 130 to the poweramplifier 126.

In a 2^(nd) configuration, the transmitter section 82 may be configuredto up convert the outbound low IF signal 128 to the outbound RF signal136 having a carrier frequency of 2.4 gigahertz. In this configuration,the 1^(st) transmitter IF stage 120 produces the 1^(st) outbound RFsignal 130 having a carrier frequency of 900 megahertz. Transmitterswitch module 124 provides the 1^(st) outbound RF signal 130 to the2^(nd) transmitter IF stage 122. The 2^(nd) transmitter IF stage 122 upconverts the 1^(st) outbound RF signal 130 to the 2^(nd) outbound RFsignal 132 having a carrier frequency of 2.4 gigahertz based on the1^(st) local oscillation 81 having a frequency of 1.5 gigahertz. The2^(nd) transmitter switch module 200 is configured to pass the 2^(nd)outbound RF signal 132 to the power amplifier.

In the 3^(rd) configuration, where the transmitter section 82 isconfigured to convert the outbound low IF signal 128 into the outboundRF signal 136 having a carrier frequency of 5.25 gigahertz, the 1^(st)transmitter IF stage 120, transmitter switch 124 and 2^(nd) transmitterIF stage 122 are active to produce the 2^(nd) outbound RF signal 132having a carrier frequency of 2.4 gigahertz.

The 2^(nd) transmitter switch module 200, in this configuration,provides the 2^(nd) outbound RF signal 132 to the 3^(rd) transmitter IFstage 202. The 3^(rd) transmitter IF stage 202 up converts the 2^(nd)outbound RF signal 132 based on the 3^(rd) local oscillation 204, whichmay have a frequency of 2.85 gigahertz, to produce the 3^(rd) outboundRF signal 206. The 2^(nd) transmitter switch module 200 provides the3^(rd) outbound RF signal 206 to the power amplifier 126, which outputsthe outbound RF signal 136 having a carrier frequency of 5.25 gigahertz.

The preceding discussion has presented a wide bandwidth transceiver thatis capable of supporting multiple wireless communication standards. Asone of average skill in the art will appreciate, other embodiments maybe derived from the teaching of the present invention, without deviatingfrom the scope of the claims.

1. A wide bandwidth transceiver comprises: local oscillation modulecoupled to generate a first local oscillation and a second localoscillation; a transmitter section coupled to convert at least one of anoutbound baseband signal and a low intermediate frequency (IF) signalinto a first outbound radio frequency (RF) signal based on the secondlocal oscillation when the wide bandwidth transceiver is in a secondwireless standard mode and coupled to convert the at least one of theoutbound baseband and the low IF signal into a second outbound RF signalbased on the first and second local oscillations when the wide bandwidthtransceiver is in a first wireless standard mode; and a receiver sectioncoupled to convert a first inbound RF signal into at least one of aninbound low IF signal and a baseband signal based on the first andsecond local oscillations when the wide bandwidth transceiver is in thefirst wireless standard mode and coupled to convert a second inbound RFsignal into the at least one of the inbound low IF signal and thebaseband signal based on the second local oscillation when the widebandwidth transceiver is in the second wireless standard mode.
 2. Thewide bandwidth transceiver of claim 1 comprises: the first wirelessstandard mode including at least one of: IEEE 802.11, Bluetooth,advanced mobile phone services (AMPS), digital AMPS, global system formobile communications (GSM), code division multiple access (CDMA), localmulti-point distribution systems (LMDS), multi-channel-multi-pointdistribution systems (MMDS), and variations thereof; and the secondwireless standard mode including at least one of: IEEE 802.11,Bluetooth, advanced mobile phone services (AMPS), digital AMPS, globalsystem for mobile communications (GSM), code division multiple access(CDMA), local multi-point distribution systems (LMDS),multi-channel-multi-point distribution systems (MMDS), and variationsthereof.
 3. The wide bandwidth transceiver of claim 1 comprises: thelocal oscillation module coupled to generate a third local oscillation;the transmitter section coupled to convert the at least one of theoutbound baseband and the low IF signal into a third outbound RF signalbased on the first, second, and third local oscillations when the widebandwidth transceiver is in a third wireless standard mode; and thereceiver section coupled to convert a third inbound RF signal into theat least one of the inbound low IF signal and the baseband signal basedon the first, second, and third local oscillation when the widebandwidth transceiver is in the third wireless standard mode.
 4. Thewide bandwidth transceiver of claim 1, wherein the receiver sectioncomprises: a first low noise amplifier coupled to amplify the firstinbound RF signal to produce an amplified first inbound RF signal; asecond low noise amplifier coupled to amplify the second inbound RFsignal to produce an amplified second inbound RF signal; a firstreceiver IF stage, when enabled, converts the amplified first inbound RFsignal into a first inbound IF signal based on the first localoscillation; receiver switching module coupled to pass one of the firstinbound IF signal and the second inbound RF signal to produce a selectedinbound signal; and second receiver IF stage coupled to convert theselected inbound signal into the at least one of the inbound low IFsignal and the baseband signal based on the second location oscillation.5. The wide bandwidth transceiver of claim 1, wherein transmittersection comprises: a first transmitter IF stage coupled to convert theat least one of the outbound baseband and a low IF signal into the firstoutbound RF signal based on the second local oscillation; a secondtransmitter IF stage, when enabled, converts the first outbound RFsignal into the second outbound RF signal based on the first locationoscillation; a power amplifier operably coupled to amplifier a selectedoutbound RF signal; and a transmitter switching module operably coupledto provide one of the first outbound RF signal and the second outboundRF signal to the power amplifier as the selected outbound RF signal.